Luminescent writing display device having protective layer

Abstract

A writing and display device for producing luminescent images upon application of pressure thereon which can be readily erased and repeatedly used having a protective layer to prevent damage to the writing surface thereof. The device includes a backing member with a smooth surface over which a translucent or transparent sheet containing a luminescent dye or pigment and an opaque pliable plastic sheet are disposed. At least one of the sheets is formed of a pliable plastic with its interface surface tending to adhere to the interfacing surface of the other sheet when a pressure is applied thereto to produce luminescent images. A pliable, transparent protective sheet is disposed adjacent to and coextensive with the translucent or transparent luminescent sheet. Upon application of pressure onto the protective sheet, which pressure is transmitted to the luminescent sheet by virtue of the pliability of the protective sheet, the interfacing surfaces adhere to each other to thereby produce a luminescent image.

Wherefore, I claim: 
     
       1. A writing and display device for producing a semi-permanent luminescent image upon the application of a writing pressure thereon comprising: a rigid backing member;   an opaque sheet disposed contiguous to said rigid backing member;   a transparent plastic sheet disposed contiguous to said opaque sheet to be in direct interfacing relationship therewith, said transparent plastic sheet containing a tinting material integrally dispersed throughout, said transparent plastic sheet further being pliable so that upon the application of a pressure thereon, the respective surfaces of said transparent sheet and said opaque sheet are urged into intimate contact at the points of applied pressure to form a luminescent image along the points of applied pressure that will be retained thereon so long as said transparent tinted sheet and said opaque sheet are adhered to one another along the points of applied pressure; and   a transparent cover sheet disposed adjacent to said transparent plastic sheet said transparent cover sheet transmitting said writing pressure to said transparent plastic sheet so as to allow uninterrupted writing.   
     
     
       2. The writing and display device of claim 1, wherein said rigid backing member is formed of an inexpensive cardboard material. 
     
     
       3. The writing and display device of claim 1, wherein said opaque sheet is formed of a pliable vinyl type plastic having a smooth, wetable type surface appearance. 
     
     
       4. The writing and display device of claim 1, wherein said tinting material comprises a luminescent pigment. 
     
     
       5. The writing and display device of claim 1, wherein the surfaces of said sheets have exposed smooth surfaces for direct contact at the interface thereof. 
     
     
       6. The writing and display device of claim 1, wherein said transparent sheet, said opaque sheet and said transparent cover sheet are substantially co-extensive in size. 
     
     
       7. The writing and display device of claim 1, wherein said transparent sheet is readily separable from said opaque sheet for effecting the erasure of any image formed thereon. 
     
     
       8. The writing and display device of claim 1, wherein said transparent cover sheet is composed of clear acetate. 
     
     
       9. A writing and display device for producing a semi-permanent luminescent image upon application of a writing pressure thereon comprising: a rigid backing member;   an opaque sheet having smooth exposed surfaces disposed contiguous to said rigid backing member;   a transparent plastic sheet having smooth exposed surfaces disposed contiguous to said opaque sheet to be in direct interfacing relationship therewith, said transparent plastic sheet containing a luminescent pigment tinting material integrally dispersed throughout, said transparent plastic sheet further being pliable so that upon the application of a pressure thereon, the respective surfaces of said transparent sheet and said opaque sheet are urged into intimate contact at the points of applied pressure to form a luminescent image along the points of applied pressure that will be retained thereon so long as said transparent tinted sheet and said opaque sheet are adhered to one another along the points of applied pressure, said transparent plastic sheet being substantially co-extensive in size with said opaque sheet, said transparent plastic sheet further being readily separable from said opaque sheet for effecting the erasure of any image formed thereon; and   a transparent cover sheet having smooth exposed surfaces disposed adjacent to said transparent plastic sheet, said transparent cover sheet being substantially co-extensive in size with said transparent plastic sheet said transparent cover sheet transmitting said writing pressure to said transparent plastic sheet so as to allow uninterrupted writing.